Improvement in scroll-saws



UNITED STATES PATENT OEEICE WILLIAM GARDNER, OF GLEN GARDNER STATION,(CLARKSVILLE P. 0.,)

NEW JERSEY.

IMPROVEMENT IN SCROLL-SAWS.

Specification forming part of Letters Patent No. 113,042, dated March28, 1871.

To all whom it may concern:

Be it known that I, WILLIAM GARDNER, of Glen Gardner Station,(Clarksville P. 0.,) in the county of Hunterdon and State of New Jersey,have invented new and useful Improvements in Gig-Saws; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawing, forming a partof this specification.

This invention consists in novel means of hanging, straining, andoperating a gig-saw, whereby a positive motion is provided for, and itisenabled to be driven more rapidly than when its motion in one directionis produced by a spring.

ln the accompanying drawing, Figure 1 is a front elevation of a gig-sawconstructed according to my invention, and Fig. 2 is a transversesection of the same.

Similar letters of reference indicate corresponding parts in bothfigures.

A is the saw, which works through a table,

. B, and is buckled at its ends to blocks C D,

that slide in guides c c and d d on a stationary frame, F.

W is a beam, whose fulcrum or center p is provided on averticallyarranged post, I, which is fitted to slide in bearings M onthe upper portion of the said frame F, but is stationary during theoperation of the saw.

The beam is connected at one end with the block C by a rod, J, which isattached to the said block in such manner as to turn freely therein.This rod has a screw-thread formed on its upper part, which operateswithin a rocking nut, n, in the said end of the beam, the other end ofwhich is connected, by a wirerope or rod, H, and strap P', with a crank,G, on one end of the horizontal driving-shaft S, which is arranged belowthe saw, parallel with the plane of motion of the beam W.

The post Ihas pivoted to it the forward end of a lever, L, the fulcrumof -which is on the frame F, and by which the said post is operated tochange the fulcrum of the walkingbeam, its handle or outer end beingfitted into and held by a notch in a post, j', provided therefor on theframe.

To the lower block, D, to which the saw is buckled, there is attached astrap, P, which connects with a crank, M, which is arranged on theopposite end of the driving-shaft S in exactly the reverse position tothat in which the other crank, G, is arranged, so that when one is upthe other is down, and vice versa.

The drivin g-shaft S is supported in suitable bearings b b, betweenwhich the said shaft is provided with a pulley, T, through which poweris transmitted to the shaft.

The saw is strained by adjusting the screwrod J within the rocking nut nin the walkingbeam, and by raising thel fulcrum p of the beam by meansof the lever L. The saw is then operated with a positive motion by thecranks M and G, the one, M, producing-the downward or cutting stroke,and the other, G, by means of the walking-beam W, producing the upwardor return stroke, thereby enabling it to be worked at a much greaterspeed than when a spring is used to raise it.

When not in operation the saw mayinstantly be freed of strain byremoving the handle of the lever L from the notch in the post f, andlowering the fulcrum of the walking-beam W.

What I claim as my invention, and desire to secure by Letters Patent,is-

The iexible connections P and P', arranged to operate the saw through`medium of the walking-beam W, as shown and described.

WM. GARDNER. Witnesses: Y

FRED. HAYNEs, U. J. TUsKA.

